Motion-picture apparatus



MOTION PICTURE APPARATUS Filed August 30, 1922 3 Sheets-Sheet l 4 hre/Mor.'

May 11 1926.

1,584,31 7 E. Mr-:cHAu

MOTION PICTURE APPARATUS Filed August 30, 1922 3 Sheets-Sheet 2 JHM/liar.-

May 11 1926.

E. MECHAU morrow PICTURE APPARATUS Filed August 30. 1922 3 Sheets-Shawl'.4 :5

Patented May 11,1926.

UNITED STATES vlaarlsNT OFFICE;

MEQHAU', 0F RASTATT, GERMANY. l

MOTION-PICTURE APPARATUS.

Application led.August 30, 1922. Serial No. 585,275.

ments rotate about a common axis and are.

oscillated during their passage-through the path of the light rays in order to compensate the movement pf the picture band. To ac'- aomplish this purpose the reflecting elements are secured to special mechanical holders` which rotate also about the saidaxis and are .each universally flexibly connected thereto, for instance by means of a ball and socket bint. l J While my invention is primarily intended for use with projecting apparatus, it may also be applied to a camera. j

The principal objectof my invention is to provide a motion picture apparatus with a simple and reliable means for guidingthe holders for the reflecting elements.

Another object of the invention is to provide a device which allows the use of the device with bands having perforation holes cf varying distances.

These and other objects' and advantagesv of my .invention will become more fully known as the description thereof proceeds, and will then be more specifically dened in the appended claims.

With these and other robjects in view, my device chieiiy consists of an a paratus in n hich each holder for the reiiectlng elements is guided outside the point .of connection in a rotatable straight guide which however' is constant independently of its rotation. Although the invariability ofdirection may he also obtained by other suitable means, as for instance by. means of toothed wheels, a crank system is preferred as producing silent motion and on account of the complete absence of lost motion. For simplicity in construction the straight guides are mounted within the corresponding crank axes. The oscillation of each holder is effected by means of curved elements, whereby one curved element is provided for all lholders Lr a separate curved element for each holder. 1n the latter case it is convenient in practical construction to let these curved elements also rotate about a common axis..

The invention furthermore includes the provision of means allowing an adjustment of the curved element, or if a plurality. of such-'elements is used, of the curved elements.

In order to vary the extent of oscillation of the reflecting elements, each curved element 1s movable 'in the direction of thecommon'v axis of rotation of the holders so that the curved element .acts in the holder at a definite distance from the point of connection.

Vith these general statements of the 0bjet ts and purposes of my invention in view I will now proceed to 'describe the preferred embodiment thereof as an example ofthe many ways to practically vconstruct my invention, and it is to be understood, that while I describe and illustrate the preferred embodiment of my invention, I do not desire to limit myself'to the precise construction-herein set forth, as thev same may be varied by those skilled in theart in accordance with the particular purposes for which they are intended and the prevailing conditions'under which they are to be utilized.

In the accompanying 'drawings forming a material art of this disclosure:

Fig. 1 1s a fragmentary sectional elevation 'ci' a vmotion picture projecting apparatus embodying my invention.

Fig. 2 is a sectional plan view of the 'i same, the section being taken on line C-f-D,

of Figure 1.

Fig. 3.is a perspective view of my improved apparatus. l

' In order to better illustrate the essential parts of my invention, different parts are broken away.

-Referring -now particularly to the figures cf 'the drawings, in a casing 'a eight mirrors d1, d2 d8 substantiallv sector-shaped are arranged Vto rotate about a common axis 0 journaled in a bed b. By means of ball and socket joints f1, f2 f the mirrors are universally connected to holders e1, e2 e8.

The sockets of these joints are attached to the arms of a` star-shaped member Vfg mounted on the above mentioned axis of ro- Y tation a, while the balls are fixed on the holders e1, e2 e8.' The latter end at their parts oppositely disposed to the mirrors in laxes h1, 'h2 its, extensions of which intersect the center parts of the respective ball and socket joints.

Another star-shaped member l, also mounted on the axis c' bearseight rotatable crank ax'les k1, k2.. ks to whichthe cranks. Z1, Z2 Z8 are attached. These crank axles are parallel to the axis of ro-. tation c, and their extensions intersect also lments r1, r2

the center parts of the respective ball and I socke't joints. Within the axles k1, k2 708 straight guide slots m1, m2 fm8 are provided in which small parallel members nl, n2 ns are guidedin such'a manner that the members are always .parallel to each other; for this purpose the members are rotatably mounted on the axes h1, h2 hs. v

On the bed b another star-shaped mem'- bei 0 is arranged, rotatable about an axis p. |The star-shaped member o carries eight ti'unnion's '(11, g2 g8 fitting into the cranks. Z1, Z2 Z8, and eight curved elers adapted to be engaged by eight rotatable rollers sp1, s2 s" located also on the axes h1, h2 hg. For the purpose of lclearer illustration of the straight guides, the rollers are omitted in Figure 2 with the exception of rollers s3.

In order to move-the star-shaped member o in the direction of its axis of rotation, a toothed nut t is provided on bed Z) which can be rotated by means of a toothed Wheel u and a levero. l;

Assumed, for instance, that the axes k2 and q2 and the axes c and p werey extended until they intersect a plane perpendicular to the axis of rotation c, it will readily be understood, that the straight guide m2 cannot change itsdirection during the rotation, if the a'xes k2, g20 and p are lso distanced from each other, so that the'lines connecting the points of intersections with the said plane form avparallelogram. The same is true with respect `to the other straight guides. Y

In order to move all holders e1, e2 e8 in the same direction, all straight guides are disposed parallel to the plane as shown in Figure. 1. To the plane shownv in Figure l are parallelv also the planes-of reflec-` tion of the mirrors d1, d2 8.

The 'proper oscillation of the mirrors is produced by the curved elements r1, 1'2 rs.

Owing to their rotation they turn relatively to the lstraightguides' m1, m2 m8 respectivelyto the cranks Z1, Z2 Z8, and the rollers s1, s2 sa, run along these elements. The form of the curves of these elements, as shown in Figures 2 and 3, is so selected, that a compensation of the movement of the image is obtained.' The run'- nin of the rollers inthe curved elements pro uces a movement of the holders'respec- Vtively of the mirrors about the ball and v(iii socket joints. lAllcurved elements have the same form and the same distance from the point of connection with the holders. lIf this distance is varied by the operation of lever o, the extent of the oscillation of the mirrors is increased or decreased. In this Way the apparatus canv be acconmiodated to the varying distances between the perforation holes in the different makes of films.

If for instance a lilm band having greater distances between the perforation holes is -used than the previously used iilniband, the

curved elements are brought nearer or closer to their points of connection, while with the use of a filmband with smaller distances between the perforations, the curved elements invention, what by Letters Pata motion picture apparatus including a continuously moving picture band, reflecting elements, an axis, holders for the reflecting Velements, universally movable joints for connecting said holders to said axis, means for rotating said holders about a common axis, and means for guiding each holder outside its joint in a constant-stiaight direction.

2. In a motion picture apparatus including a continuously moving picture band, re-

iiecting elements, and axis, holders for the reflecting elements, universally movable joints :tor connecting said. holders to said axis, straight guides for guiding each holder outside its joint in a constant straight difor rotating said holders and straight guides about a common axis.

3. In a motion picture apparatus including a continuously moving picture band, reiiecting elements, an axis, holders for the relecting elements, universally movable joints for connecting said holders to said axis, straight guides for' guiding each holder rection, and means outside its joint in a constant straight direction, means for rotating said holders and straight guides about a common axis, an means for ensuring the invariability of the direction of the rotating straight guides.

4. In a motion picture apparatus includ- -ing a continuously moving picture band, re-

an axis, holders for the reflecting elements, universally movable joints for connecting said holders to said axis4 straight guides for guiding each holder outside its joint in-a constant straight direction means for rotating said holders and straigh guides about a common axis, and a system oi cranks for ensuring the invariability of th( direction of the rotating straight guides.

5. In a motion picture apparatus including a continuously moving fleeting elements,

picture band, reflect ing elements, an axis, holders lfor the reflect ing elements, universally movable joints fo: connecting said holders to said axis, straigh guides for guiding each holder outside it joint in a constant straight direction, mean for rotating said holders and straight guide about a common axis, and a system of crank for ensuring the invari' bility of the direc tion of the rotating straight guides, the lai ter being arranged within the correspondin crank axes.

6. In a motion picture apparatus with continuously moving picture band, reflecting elements, an axis, holders for the reflecting elements, universally movable joints for connecting said holders to said axis, straight guides for guiding each holder outside its joint in a constant straightdirection, means for rotating said holders and straight guides about the said axis. and curved elements for all holders for oscillating the reflectingelements.

7. In a motion picture apparatus including a continuously moving picture band, reflecting elements, an axis, holders for the reflecting elements, universally movable joints for connecting said holders to said axis, straight guides for guiding each holder outside its joint in a constant straight direction, means ior rotating said holders and straight guides about a common axis, and curved elements for all holders for oscillating the reflecting elements, the curve ofy said elements being adjustable in the direction of said axis.

8. In a motion picture apparatus including a continuously moving picture band, reflecting elements, an axis, holders for the refleeting elements, universally movable joints for connecting said holders to saidaxis, straight guides for guiding each holder outside its joint in a constant straight direction, means for rotating said holders and straight guides about a common axis, and a curved element for each holder for oscillating the 'rei-lectin g elements.

9. In a motion picture apparatus including a continuously moving picture band, reflecting elements, an axis, holders for the reflectingv elements, universally movable joints for connecting said holders to said axis, straight guides for guiding each holder outside its joint in a constant straight direction, means for rotating said holders and straight guides about a common axis, and a curved element for each holder for oscillatt ing the reflecting elements, said curved elements being adjustable in the direction of said axis. y

10. In a motion picture apparatus including a continuously moving picture band, re fleeting elements, an axis, holders for the refleeting elements, universally movable joints for connecting said holders to said axis, straight guides for guiding each holder in a constant straight direction, means for rotating said holders and straight guides about a 5J common axis, a system of cranks for ensuring the invariability of the direction of the rotating straight guides, the latter being i arranged within the corresponding crank axes, and -a curved element for each holder for oscillating the reflecting elements, the curved element being adjustable in the direction of said axis.

11. In a motion picture apparatus including a continuously moving picture band, refleeting elements, an axis, holders for the refleeting elements, a ball and socket joint for each holder for connecting the latter to said axis, straight guides for guiding each holder in a constant straight direction, means for rotating s-aid holders and straight guides about a common axis, a system of cranks for ensuring the invariabilty of the direction ol the rotating straight guides, aicurvcd element for each holder for oscillating the re- A'I5 fleeting elements, and means for rotating the 'curved elementsabout the second axis, the curved elements being adjustable in the direction of the second axis.

In testimony. whereofl I have signed my name to this specification.

EMIL MECHAU. [1i 8.] 

